﴿ أَمْ تَسْـَٔلُهُمْ أَجْرًۭا فَهُم مِّن مَّغْرَمٍۢ مُّثْقَلُونَ ﴾

“Or is it that [they fear lest] thou ask them for a reward, [O Prophet,] so that they would be burdened with debt [if they listened to thee]?”

Please check ayah 68:47 for complete tafsir.